High temperature resistance gel plugging agent and preparation method and application thereof

A technology of high temperature resistance and plugging agent, applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve the problems of effective pressure bearing plugging in well completion, and achieve high pressure bearing capacity and temperature resistance Good, the effect of broadening the scope of application

Active Publication Date: 2019-01-29
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of effective pressure-bearing plugging in completion, workover and production of deep oil and gas reservoirs in snubbing operation under high temperature conditions, the purpose of the present invention is to provide a high temperature resistant jelly plugging agent and its Preparation method and application

Method used

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  • High temperature resistance gel plugging agent and preparation method and application thereof
  • High temperature resistance gel plugging agent and preparation method and application thereof
  • High temperature resistance gel plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a high-temperature-resistant jelly sealing agent. The raw material components of the high-temperature-resistant jelly sealing agent include:

[0031]

[0032]

[0033] pH regulator: sodium bicarbonate (for pH adjustment to 10),

[0034] and the remainder of the water.

[0035] The preparation method of sulfonated modified wheat starch in this embodiment is: in 80mL water, add 2g of wheat starch, 0.02g of cumene peroxide, 0.02g of sodium bisulfite, 4g of N-p-tolyl horseradish To imide and 6g of 2-acrylamido-2-methylpropanesulfonic acid, adjust the pH value to 10, heat and stir to 100°C, react for 90min, separate and purify with ethanol, filter and dry to obtain the sulfonated Modified wheat starch.

[0036] The present embodiment also provides a preparation method of the above-mentioned high temperature-resistant jelly plugging agent, which includes the following steps:

[0037] According to the raw material formula, add sulfonated modif...

Embodiment 2

[0040] This embodiment provides a high-temperature-resistant jelly sealing agent. The raw material components of the high-temperature-resistant jelly sealing agent include:

[0041]

[0042] The preparation method of sulfonated modified cellulose in this example is: in 80mL of water, add 2g of cellulose, 0.04g of cumene peroxide, 0.04g of sodium bisulfite, 2g of N-p-tolyl horseradish To imide and 4g of 2-acrylamido-2-methylpropanesulfonic acid, adjust the pH value to 10, heat and stir to 100°C, react for 45min, separate and purify with ethanol, and obtain the sulfonated Modified cellulose.

[0043] The present embodiment also provides a preparation method of the above-mentioned high temperature-resistant jelly plugging agent, which includes the following steps:

[0044] According to the raw material formula, add sulfonated modified cellulose, azobisisobutyronitrile, acrylamide, 2-acrylamide-2 methylpropanesulfonic acid, paraformaldehyde, melamine, ammonium chloride and wat...

Embodiment 3

[0047] This embodiment provides a high-temperature-resistant jelly sealing agent. The raw material components of the high-temperature-resistant jelly sealing agent include:

[0048]

[0049] The preparation method of sulfonated modified cornstarch in this example is: in 80mL of water, add 2g of cornstarch, 0.04g of cumene peroxide, 0.02g of sodium bisulfite, 4g of N-p-tolyl horseradish To imide and 6g of 2-acrylamido-2-methylpropanesulfonic acid, adjust the pH value to 11, heat and stir to 110°C, react for 60min, separate and purify with ethanol, filter and dry to obtain the sulfonated Modified corn starch.

[0050] The present embodiment also provides a preparation method of the above-mentioned high temperature-resistant jelly plugging agent, which includes the following steps:

[0051] According to the raw material formula, add sulfonated modified corn starch, ammonium persulfate, acrylamide, 2-acrylamide-2 methylpropanesulfonic acid, paraformaldehyde, melamine, urotropine...

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Abstract

The invention provides a high temperature resistance gel plugging agent and a preparation method and an application thereof. Raw material of the high temperature resistance gel plugging agent include,100% by weight, the following components: 2%-5% of sulfonation modification polysaccharide, 0.01%-0.025% of an initiator, 20%-25% of a small molecule monomer, 1.2%-1.5% of a cross-linking agent A, 1.3%-1.7% of a cross-linking agent B, 0.04%-0.1% of a curing agent, 0.03%-0.3% of a pH conditioning agent, with the balance being water. The high temperature resistance gel plugging agent provided by the invention is high in pressure bearing capacity, can meet basic performance requirements of non-well killing job on a gel system, is particularly suitable for the field of underbalanced operation ofmedium and high pressure oil and gas wells, is controllable in glue forming time, is wide in range of application, is good in temperature resistance, can adapt to a temperature range of 100-150 DEG C,is simple in preparation process, and can meet process requirements of field applications of the non-well killing job.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a high-temperature-resistant jelly plugging agent and a preparation method and application thereof. Background technique [0002] With the in-depth research and popularization and application of underbalanced drilling and completion technology, domestic and foreign oil companies have higher and higher technical requirements for underbalanced operations. As a new pressure control method that uses chemical intelligent colloids instead of mechanical valves, jelly valves are gradually developed. In the process of underbalanced drilling and completion, a certain length of basic glue is injected into the wellhead to make it spontaneously form glue under downhole temperature and pressure, and use its body strength and adhesion to the pipe wall to isolate the downhole pressure. Avoid oil and gas overflow, and play a role in protecting the reservoir during the snub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/44C08F290/10C08F220/56C08F220/58E21B33/13
CPCC08F290/10C09K8/42C09K8/44E21B33/13C08F220/585
Inventor 程立李振廖锐全刘德基张慢来秦义鲁晓华
Owner PETROCHINA CO LTD
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